Linked from
The 4 pages that link to Polearm, each with the reason it gives.
SpearNarrower topic: The spear belongs to this broader family of long-shafted weapons.
PartisanNarrower topic: The partisan is one member of this broad family of shaft-mounted weapons.
HalberdNarrower topic: The halberd belongs to this broad family of long-shafted weapons.
War hammerNarrower topic: The war hammer belongs to the broader family of hafted weapons.